From ae2ee2f4ea51785f408606ffd1195c84b0641f49 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 6 May 2016 12:32:47 +0100
Subject: [PATCH] pinctrl-bcm2835: Return pins to inputs when freed

When dynamically unloading overlays, it is important that freed pins are
restored to being inputs to prevent functions from being enabled in
multiple places at once.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -831,6 +831,15 @@ static const struct pinctrl_ops bcm2835_
 	.dt_free_map = bcm2835_pctl_dt_free_map,
 };
 
+static void bcm2835_pmx_free(struct pinctrl_dev *pctldev,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	/* disable by setting to GPIO_IN */
+	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
 static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
 {
 	return BCM2835_FSEL_COUNT;
@@ -890,6 +899,7 @@ static int bcm2835_pmx_gpio_set_directio
 }
 
 static const struct pinmux_ops bcm2835_pmx_ops = {
+	.free = bcm2835_pmx_free,
 	.get_functions_count = bcm2835_pmx_get_functions_count,
 	.get_function_name = bcm2835_pmx_get_function_name,
 	.get_function_groups = bcm2835_pmx_get_function_groups,
